87130178 has 4 divisors (see below), whose sum is σ = 130695270. Its totient is φ = 43565088.

The previous prime is 87130157. The next prime is 87130193. The reversal of 87130178 is 87103178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65011969 + 22118209 = 8063^2 + 4703^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21782543 + ... + 21782546.

Almost surely, 2^87130178 is an apocalyptic number.

87130178 is a deficient number, since it is larger than the sum of its proper divisors (43565092).

87130178 is a wasteful number, since it uses less digits than its factorization.

87130178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43565091.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 87130178 is about 9334.3547179224. The cubic root of 87130178 is about 443.3256577461.

Subtracting from 87130178 its reverse (87103178), we obtain a cube (27000 = 30³).

The spelling of 87130178 in words is "eighty-seven million, one hundred thirty thousand, one hundred seventy-eight".